Had a hard time with my inventory recently.
I needed to swap out an item I had equipped with one that was in my bag. The game would not allow me to drag the equipped item over the new item and simply swap places.
So I gave in, threw away something to make an empty slot in my bag. I dragged the equipped item to that slot, but it would not settle into the slot. I tried multiple times, varying just a bit with how I lined up the icon with the empty slot, and it refused to settle into that slot.
What I had to do was remove an item from my full armory, put that item into the empty bag slot, and then move the equipped piece to the armory. THEN I was able to equip the new piece.
This process is absolutely ridiculous. I know my full inventory is something that needs to be managed, but c'mon, this is a fairly new game. The UI should allow for two items to simply swap places if you drag one on top of the other. Other older games allow for it, this game should as well.
TL;DR - Inventory UI needs to be smarter
